Book/Report

FZJ-2018-06400

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Recycling source terms for edge plasma fluid models and impact on convergence behaviour of the BRAAMS "B2" code

Maddison, G. P. ; Reiter, D.FZJ*

1994
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/20019

Report No.: Juel-2872

Abstract: Predictive simulations of tokamak edge plasmas require the most authentic description of neutral particle recycling sources, not merely the most expedient numerically. Employing a prototypical ITER divertor arrangement under conditions of high recycling, trial calculations with the "B2" steady-state edge plasma transport code, plus varying approximations of recycling, reveal marked sensitivity of both results and its convergence behaviour to details of sources incorporated. Comprehensive EIRENE Monte Carlo resolution of recycling is implemented by full and so-called "short" intermediate cycles between the plasma fluid and statistical neutral particle models. As generally for coupled differencing and stochastic procedures, though, overall convergence properties become more difficult to assess. A pragmatic criterion for the "B2" /EIRENE code system is proposed to determine its success, proceeding from a stricter condition previously identified for one particularanalytic approximation of recycling in "B2". Certain procedures are also inferred potentialiy to improve their convergence further.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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Database coverage:

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